Amanda Bynes -- Playboy Offering Actress Her OWN RADIO SHOW

"Ask Ashley" could be making a HUGE comeback ... with a dirty twist ... because TMZ has learned, Playboy is offering Amanda Bynes her very own radio show.

Playboy Radio offered Amanda a guest hosting gig yesterday -- but now, a rep for the station tells TMZ, execs want her around FULL-TIME ... and have officially submitted an offer for Amanda to host her OWN hour-long daily radio show.

The offer is for a one-week trial ... but if all goes well, we're told Amanda can extend the deal to a full year.

Playboy's pulling out all the stops to make her feel welcome too -- we're told the org. is willing to provide Bynes with a driver to take her to work ... as well as her very own producer to handle the show's logistics.

FYI -- Bynes became a breakout star on "All That" back in the day thanks to the popularity of her "Ask Ashley" sketches ... when she would give crazy advice to fans.

2:36 PM PT -- We JUST heard back from Bynes ... who, unfortunately, delivered some bad news for Playboy.

"I want to [do the show]," Amanda said ... "But I can’t because I’m recording an album!"

Sidenote: Amanda says she's an aspiring rap star.